Rifampin is known to cause which discoloration?

Rifampin is known for causing a distinctive red-orange discoloration in bodily fluids, including sweat, urine, and tears. This occurs because rifampin, a potent antibiotic used primarily to treat tuberculosis and other bacterial infections, has chromophores that absorb light and impart this characteristic hue. The color change is harmless and related to the drug's chemical structure, which allows it to penetrate tissues and be excreted in a pigmented form.

During therapy with rifampin, patients should be advised about this potential side effect so they are not alarmed by the color changes in their urine or bodily secretions. This awareness is particularly important for individuals who may be concerned about staining clothing or personal items. The other options represent color changes associated with different conditions or substances and are not related to the effects of rifampin.